On Wed, Sep 11, 2013 at 04:28:46PM -0600, The Doctor wrote:

> tcpudump gives me
> 
>     C: RCPT TO: <Undisclosed-Recipient:;>
>     S: 501 <Undisclosed-Recipient:;>: "@" or "."
>     C: QUIT

The client is putting garbage into the message envelope.  RFC 2822
group addresses:

        display-name ":" [ mailbox-list ] ";"

MUST NOT leak into the message envelope.  In partucilar:

        To: Undisclosed-Recipient:;

is an empty list of addresses, not an address.  See:

    http://tools.ietf.org/html/rfc2822#section-3.4

-- 
        Viktor.

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